68-86 2wd & 68-81 4wd Bb

The Hedman 68-86 2wd & 68-81 4wd Big Block Chevy headers are engineered exhaust manifold replacements designed for serious enthusiasts building or restoring full-size GM trucks and SUVs. These street-oriented headers replace restrictive factory cast-iron manifolds that rob horsepower and create heat management issues under the hood. Whether you're upgrading a classic K5 Blazer, Suburban, or full-size pickup with a Big Block engine, these headers unlock the breathing potential of your powerplant and improve overall engine efficiency.

Constructed from mandrel-bent steel tubing with a durable black paint finish, the Hedman headers feature 1.75-inch primary tubes that merge into a 3-inch collector, optimizing scavenging and exhaust flow velocity across the Big Block's eight cylinders. The stepped primary design ensures back-pressure control while maximizing exit velocity, a critical factor when tuning naturally aspirated big-displacement engines. Complete gasket and hardware kits are included, eliminating the need for separate purchases and ensuring a complete bolt-on installation without fabrication or fitment surprises.

This pair fits both two-wheel-drive and four-wheel-drive configurations across the specified model years, making them a universal solution for anyone upgrading their vintage GM full-size truck or SUV platform. The headers are ideal for restorations seeking OEM-style appearance with modern performance gains, or for hot rod builds prioritizing naturally aspirated power delivery. Installation is straightforward for owners with basic mechanical skill; the black paint finish resists oxidation and blends with modern engine bays, while the tuned collector diameter ensures compatibility with most aftermarket exhaust systems and mufflers.